Effect of Heat on Regulation of Body Fluids and Electrolytes in Dogs

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Abstract
The sensitivity of dogs to changes in air temp. was shown in the urinary concns. during and after exposure. High environmental temp. caused, after initial increase, a fall in both ouput and concn. of Na and Cl. K excretion in contrast was markedly elevated. The final U/P ratio for Na or Cl never exceeded 1, while the final U/P ratio for K was well over 100. During exposure to heat the water deficit became increasingly greater, the intracellular vol. loss increasing most. The panting of the dog to maintain body temp. by evaporative cooling constituted hyperventilation, for increased arterial pH and lowered CO2 content accompanied increase in urinary pH and bicarbonate excretion. The extra K that appeared in the urine came largely from the intracellular fluid.

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